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Presentation of the cluster A and the common amino acids predicted by both the theoretical model and genuine structure of the spike RBD in the crystal structure of the complex of the SARS-CoV S protein RBD and receptor ACE2.20 The spike RBD is shown in cornflower blue. The ACE2 is presented in green. Cluster A (residues 450–480 of the spike) are colored red. The predicted common residues (highlighted in Table 5) are colored in yellow.
